1. Bird, L. and Kuhn, A.T., Chem. Soc. Rev., 1981, vol. 10, p. 49.
2. Tanaseichuk, B.S., Tomilin, O.B., and Butin, K.P., Zh. Org. Khim., 1982, vol. 18, p. 241.
3. Monk, P.M.S., The Viologens: Physicochemical Properties, Synthesis, and Application of the Salts of 4,4′-Bipyridine, Chichester: Wiley, 1998.
4. Miyachi, M., Yamonoi, Y., Shibata, Y., Matsumoto, H., Nakazato, K., Konno, M., Ito, K., Inoue, Y., and Nishihara, H., Chem. Commun., 2010, vol. 46, p. 2557.
5. Saotome, Y., Endo, T., and Okawara, M., Macromolecules, 1983, vol. 16, p. 881.